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Sprocket and Drive wheels

We manufacture a complete product line of drive wheels for any kind of belt drive designs which are common in harvesting applications. It is important that the belting’s operational characteristics and the type of belt drive are matched for optimum conveyor reliability and rod life.

The drive wheels can be subdivided into 4 driving methods:

Driving method

Belting profile

Type of drive wheel

Via the rods

Low profiles, double profiles

HS, RT and Z

Via under belt cams

High profiles, double profiles

N

Via rods and cams

High profiles, double profiles

NC

Friction drive

All profiles

FR, FRD, HS and KW

Cast iron forms the heart of all drive options. Most sprockets and drive wheels are splittable to facilitate mounting & replacement. Wheel halves are matching pairs and must not be mixed. Our drive wheels are supplied bored & keyed to your specification and as required, with one set screw over the key way, optionally also at 90 degrees. We can also supply a ‘raw bore’ to be machined by yourself. Clamp fit: Only possible with splittable types. Hub is slightly under bored, plus 1 or 2 optional set screws. Practical when drive shafts are of reasonable close tolerance. Keyway types and sizes are cut to German DIN (metric) or imperial standards. Friction drive types FR, FRD and KW can be used with any belt type and pitch. Minimum-maximum bore size is indicated in each type´s data sheet. Ideally relate to the most popular standard hub types.

Alternative hub types may also be possible

HS type sprockets

Drive teeth operate directly against down convexity rivet rods. The traction belting is supported by the side cage fingers to prevent wear in the tooth root, and to ensure life long constant pitch circle diameter. Base length of flights or rod covering will require sprocket clear ways. On request tips of teeth can be machined down to avoid crop damage. Upon special (volume related) request a ‘VN’ hub extension is also possible, extending the bore/keyway length into the finger cage area. By adding a Z to the order code (HSZ) you will obtain a unit without cage support fingers, applicable when two are needed on either side of a central traction belt.

3TB type sprockets

Drive teeth operate directly against up convexity rivet rods. They are frequently used in conveyors with 1 or more centre belts, to which the rods are attached by clips or clamps (see chapter 4, centre belt construction). The rod with a centre clamp is mostly positioned higher and therefore demands a larger pitch circle diameter. 3 TB drive wheels are found among drive types HS, RT, NC and Z. Base length of flights or rod covering requires sprocket run clear ways.

RT type sprockets

Similar to the tooth drive HS type but with solid side ring support flange. A scraper is needed to keep the ring’s work surface clean. RT units offer perfect pitch circle diameter for severest load applications. They are very popular in sugar beet harvester applications.

Z type sprockets

Toothed drive wheel without under belt. Therefore tooth & rod wear rate will be higher than with HS or RT type drive wheels. Well suited for light duty applications, or when HS or RT type belt support is impractical. Sometimes fitted in place of an end idler roller when soil compaction or rock is a problem. Base length of flights or rod covering requires sprocket run clear ways.

NC type drive wheels

Designed for a cam profile belting drive in combination with a tooth drive of the rod. Primary drive via cage fingers engaging under the cam profile of the belting. Designed to prevent cam drive slip under severe load situations. Then drive teeth engage rods. Base length of flights or rod covering requires sprocket run clear ways. Endless, overlap, BC or E joining clips needed to retain cam profile joint.

N type drive wheels

Designed for cam profile belting. Drive via cage fingers engaging under the cam profile of the belting. To obtain best working characteristics select largest operational diameter possible. Types with the codes ST or STH indicate, cage fingers do not contact the rivet retaining plates. Belt guidance offered via the external flange. The securing hub is incorporated inside the support cage area. The base length of flights or rod covering is the distance between the internal belting edges. Endless, overlap, BC or E joining clips needed to retain cam profile joint. Low wear rate, no metal to metal contact. Silent running.

FR type drive wheels

Non-splittable friction drive wheels with rubber lining. Bored & keyed to your specification, requiring at least one set screw over the key way. Optionally with another set screw at 90 degrees. May be used to drive conveyors of any belt pitch or belt profile. The rubber surface offers high rubber to rubber traction, but may require a scraper to be fitted under severe soil compaction conditions. The thick rubber layer minimizes soil compaction via its flexing operating surface. To obtain best working characteristics select largest operational diameter possible. Provide a ‘snug’ roller at 7 o´clock position for maximum degree of belt wrap. Low wear rate, no metal to metal contact. Silent running.

FRD type drive wheels

Splittable friction drive wheels with rubber lining to reduce fitting time Other features see FR type drive wheels. KW type drive wheels A splittable all cast iron range of friction drive wheels. Usage as idler wheel also possible. Under belt cage system is independent of belt pitch. Normally used in conjunction with a low profile type traction belting. Provides a ‘snug’ roller at 7 o´clock position for maximum degree of belt wrap. Bored & keyed to your specification, requiring at least one set screw over the key way. Optionally with another set screw at 90 degrees. Low wear rate. Silent running.